Hi Hideaki, On the latest SDK, I see that there is a check for HW flow control. Can you please ask the customer to refer the file uart_v0_lld.c Inside this file, there is a call made with the help of an API called: UART_hardwareFlowCtrlOptSet This has an argument of UART_RTS_CTS_ENABLE which basically says, both RTS and CTS is enabled. The macro UART_RTS_CTS_ENABLE has a value of 3 which is 11b hence both CTS and RTS is enabled. We just want the RTS to be enabled, hence we have to simply pass the argument which is: UART_RTS_ENABLE So instead of the call being made as: UART_hardwareFlowCtrlOptSet ( baseAddr , UART_RTS_CTS_ENABLE ); The call should rather be: UART_hardwareFlowCtrlOptSet ( baseAddr , UART_RTS_ENABLE ); Can you please propose this to the customer and let me know if it works for them? Looking forward to your response. Regards, Vaibhav
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